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Analog Devices Inc./Maxim Integrated MAX6731UTWD3+
- Part No.:
- MAX6731UTWD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6731UTWD3+.pdf
- Description:
- SINGLE-VOLTAGE MICROPROCESSOR SU
- Quantity:
- Payment:
- Shipping:
Inventory:2,223
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Product details
Overview
MAX6731UTWD3+ from Maxim Integrated is a single-voltage microprocessor supervisor IC with push-pull active-low reset output, manual reset input, independent push-pull watchdog output, and factory-set 4.375V VCC1 reset threshold. It features 140ms–280ms reset timeout (D3 option), 1.68s normal watchdog timeout, and operates over –40°C to +85°C for reliable power monitoring in embedded control systems.
For engineers reviewing the MAX6731UTWD3+ datasheet, MAX6731UTWD3+ pinout, MAX6731UTWD3+ application, or MAX6731UTWD3+ equivalent, this page delivers verified electrical specs, SOT23-6 package mapping, functional pin roles, real-world use cases in telecom and industrial equipment, and two validated alternative parts with documented technical and application differences.
Technical Context
The MAX6731UTWD3+ integrates a precision voltage monitor for VCC1 only (no VCC2 or RSTIN support), a manual reset input with internal 50kΩ pullup, and a dual-mode watchdog timer-35s startup delay followed by 1.68s normal timeout. Its push-pull RST and WDO outputs eliminate external pullups and support direct interfacing with bidirectional μP reset pins via a 10kΩ series resistor.
It guarantees valid reset assertion down to VCC1 = +0.8V, exhibits <20ppm/°C reset threshold tempco, and rejects short VCC transients via built-in hysteresis and glitch filtering. Supply current is 14μA typical at +3.6V, enabling low-power battery-operated designs without compromising supervision integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | 4.375V (factory-set MR suffix; precise detection of +4.375V supply brownout) |
| Reset Timeout Period | 140ms min / 280ms max (D3 option; ensures sufficient hold time for processor initialization) |
| Watchdog Timeout (Normal) | 1.68s min (fast fault detection after system boot completes) |
| Supply Current | 14μA typical at +3.6V (enables multi-year operation in coin-cell-powered systems) |
| Operating Temperature | –40°C to +85°C (fully specified for industrial and telecom environments) |
| Output Type | Push-pull RST and WDO (no external pullup required; drives CMOS/TTL loads directly) |
| Package | SOT23-6 (2.9mm × 1.6mm footprint; compatible with high-density PCB layouts) |
Pinout & Package
SOT23-6 package: 2.9mm × 1.6mm × 1.1mm body, gull-wing leads, RoHS-compliant lead(Pb)-free finish (+T suffix).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output; asserts low on VCC1 drop below 4.375V, MR low, or watchdog timeout |
| 2 | GND | Ground reference for all internal comparators and outputs |
| 3 | WDO | Active-low push-pull watchdog output; asserts low if no WDI edge occurs within 1.68s (normal mode) |
| 4 | MR | Active-low manual reset input; internal 50kΩ pullup to VCC1; forces reset when pulled low |
| 5 | WDI | Watchdog input; rising/falling edges reset watchdog timer; unconnected = watchdog remains active |
| 6 | VCC1 | Primary supply input (0.8V–5.5V); powers device and feeds VCC1 monitor with 4.375V threshold |
Key Features
| Feature | Design Value |
|---|---|
| Factory-set VCC1 threshold | 4.375V (MR suffix) eliminates external resistor divider and calibration effort |
| Dual-mode watchdog timer | 35s startup delay + 1.68s normal timeout enables robust boot sequence monitoring |
| Push-pull RST/WDO outputs | No external pullup resistors needed; reduces BOM count and board space vs open-drain variants |
| Guaranteed reset validity | Operates down to VCC1 = +0.8V, ensuring reset integrity during deep brownout conditions |
| Transient immunity | Rejects sub-100ns VCC glitches; prevents spurious resets in noisy power environments |
Applications
| Telecom Line Cards | Industrial PLC Controllers |
|---|---|
Use Scenario: Monitoring +4.375V auxiliary supply powering FPGA configuration circuitry in carrier-grade line cards. IC Role / Device Role / Timing Role: Single-supply supervisor asserting reset during VCC1 sag to prevent corrupted FPGA bitstream loading. Use Value: 140–280ms reset timeout ensures full FPGA configuration before release; push-pull RST drives FPGA PROG_B pin directly without pullup. |
Use Scenario: Supervising +4.375V I/O expander rail in modular PLC backplane where brownout must trigger safe I/O shutdown. IC Role / Device Role / Timing Role: Voltage monitor and reset generator enforcing deterministic fail-safe state transition on supply fault. Use Value: Guaranteed reset down to +0.8V ensures fail-safe behavior even during severe undervoltage; 14μA quiescent current minimizes standby power draw. |
| Network Switch Power Management | Medical Diagnostic Equipment |
Use Scenario: Validating +4.375V PHY supply in 10G Ethernet switch ASIC subsystems subject to hot-swap transients. IC Role / Device Role / Timing Role: Immune-to-glitch supervisor preventing false resets during hot-insertion of line cards. Use Value: Short-duration VCC transient rejection avoids network disruption; SOT23-6 footprint fits tight ASIC power rail routing. |
Use Scenario: Ensuring clean boot of ARM-based controller in portable ultrasound devices powered by Li-ion battery with regulated +4.375V rail. IC Role / Device Role / Timing Role: Low-power supervisor maintaining system integrity across battery discharge cycle (3.0V–4.2V). Use Value: 14μA supply current extends battery life; D3 timeout aligns with bootloader execution window. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6730UTWD3+ | Open-drain RST and WDO outputs; requires external pullups; same VCC1=4.375V threshold and D3 timeout | Used where level-shifting or wired-OR reset bus is required; incompatible with direct CMOS drive | Select MAX6730UTWD3+ only if open-drain topology is mandated by system architecture. |
| TPS3808G33DBVR | Single-supply supervisor with 3.3V threshold (not 4.375V); 200ms fixed timeout; push-pull RST; no watchdog output | Lacks watchdog functionality and manual reset; suitable only for basic reset-only applications | Choose TPS3808G33DBVR only when watchdog and MR features are unnecessary and 3.3V threshold suffices. |
Compared with MAX6730UTWD3+, the MAX6731UTWD3+ saves board space and BOM cost by eliminating two pullup resistors, while its integrated watchdog and MR provide enhanced system-level fault recovery not available in TPS3808G33DBVR.
Availability
MAX6731UTWD3+ is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and medical electronics requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MAX6731UTWD3+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for demanding industrial, automotive, and communications applications.
The MAX6730–MAX6735 family targets μP-based systems needing reliable, low-power, multi-threshold voltage supervision with integrated watchdog and manual reset-optimized for space-constrained, high-reliability embedded control.
FAQ
What is the exact reset threshold voltage of MAX6731UTWD3+?
The MAX6731UTWD3+ has a factory-set VCC1 reset threshold of 4.375V (MR suffix), with ±125mV tolerance over temperature. This value is laser-trimmed and guaranteed across –40°C to +85°C, ensuring accurate detection of +4.375V supply faults without external components. The threshold applies solely to VCC1; no VCC2 or RSTIN monitoring is implemented in this variant.
Does MAX6731UTWD3+ support dual-voltage monitoring?
No, MAX6731UTWD3+ monitors only VCC1 (single-voltage). It belongs to the MAX6730/MAX6731 subgroup, which lacks VCC2 and RSTIN inputs. Dual-voltage capability requires MAX6732–MAX6733 (two fixed thresholds) or MAX6734–MAX6735 (three thresholds, including adjustable RSTIN). Pin 6 is VCC1 only; pins for VCC2 and RSTIN are absent in the SOT23-6 package of MAX6731UTWD3+.
What is the watchdog startup delay and normal timeout for MAX6731UTWD3+?
The MAX6731UTWD3+ watchdog timer provides a 35-second minimum startup delay after any reset event (power-up, brownout, or MR assertion), allowing full system initialization. Once initialized, it switches to normal mode with a 1.68-second minimum timeout period. A valid edge on WDI resets the timer; absence of edges for >1.68s asserts WDO low, triggering system recovery.
Can MAX6731UTWD3+ operate with VCC1 below 1.0V?
Yes, MAX6731UTWD3+ guarantees valid reset assertion down to VCC1 = +0.8V, per Absolute Maximum Ratings and Electrical Characteristics. Below +0.8V, reset behavior is not specified. For applications requiring reset validity down to 0V, a 100kΩ pulldown resistor from RST to GND is recommended-but this is unnecessary here since the device's push-pull output actively drives low and remains functional through the full +0.8V to +5.5V range.
Is MAX6731UTWD3+ pin-compatible with other MAX673x variants in SOT23-6?
MAX6731UTWD3+ shares the same SOT23-6 pinout as MAX6730UTWD3+, MAX6732UTxxD3+, and MAX6733UTxxD3+, with identical pin functions (RST, GND, WDO, MR, WDI, VCC1). However, functional compatibility depends on feature set: MAX6731UTWD3+ and MAX6730UTWD3+ support MR and single-voltage monitoring; MAX6732/MAX6733 add VCC2 monitoring but omit MR. Always verify schematic connectivity against the specific variant's Pin Description table.
MAX6731UTWD3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 1.665V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
MAX6731UTWD3+ FAQ
1.How can I place an order for MAX6731UTWD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6731UTWD3+ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX6731UTWD3+ reliable?
The price and inventory of MAX6731UTWD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6731UTWD3+ is usually 5 days.
3.What payment methods are accepted for MAX6731UTWD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6731UTWD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6731UTWD3+?
MAX6731UTWD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6731UTWD3+ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX6731UTWD3+?
For technical support, including MAX6731UTWD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6731UTWD3+ requirements.
6.How does Aetrix verify that MAX6731UTWD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6731UTWD3+ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX6731UTWD3+ meets industry standards.
7.What is the process for return or replacement of MAX6731UTWD3+?
All MAX6731UTWD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6731UTWD3+, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX6731UTWD3+ part is unused and in its original packaging.
Return procedure for MAX6731UTWD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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